1 #include <stdio.h> 2  3 int  main(void) 4 { 5     int a = ‘\101‘; 6     int b = ‘\0101‘;    // 错误 7     int c = ‘\x41‘; 8     int d = ‘\X41‘;     // 错误 9     printf("%d %c\n", a, a);10     printf("%d %c\n", b, b);11     printf("%d %c\n", c, c);12     printf("%d %c\n", d, d);13     14     return 0;15 }16